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Veseljchak [2.6K]

3 years ago

9

Consider a wire mounted vertically using a lab stand. if a current is flowing upward in the wire, what it the direction of the m

agnetic field from the wire at a point 2 cm west of the wire?
a. east

b. west

c. down

d. south

e. north

1 answer:

Setler [38]3 years ago

6 0

My answer is south .

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An ambulance is rapidly approaching you at a stop light. What happens to the frequency and pitch of the sound as the ambulance d

vagabundo [1.1K]

Answer:

A )

Explanation:

This change in frequency observation occur due to doppler effect

if the wave source moves,In the time between one wave peak being emitted and the next, the source will have moved so that the shells will no longer be concentric. The wavefronts will get closer together in front of the source as it travels and will be further apart behind it. (see the graph)

when the person standing still in front of the ambulance, he will observe a <em>higher frequency </em>than before as the source travels towards them.

$f_(observed)=\frac{V_(wave)}{V_(wave)-V_(source)} *f_(original)$

The pitch we hear depends on the frequency of the sound wave.

A high frequency corresponds to a high pitch

as we hear a higher frequency , it makes the <em>pitch higher</em> too

5 0

3 years ago

Read 2 more answers

A photon detector captures a photon with an energy of 4.29 ✕ 10−19 J. What is the wavelength, in nanometers, of the photon?

serious [3.7K]

Answer : The wavelength of photon is, $4.63\times 10^{2}nm$

Explanation : Given,

Energy of photon = $4.29\times 10^{-19}J$

Formula used :

$E=h\times \nu$

As, $\nu=\frac{c}{\lambda}$

So, $E=h\times \frac{c}{\lambda}$

where,

$\nu$ = frequency of photon

h = Planck's constant = $6.626\times 10^{-34}Js$

$\lambda$ = wavelength of photon = ?

c = speed of light = $3\times 10^8m/s$

Now put all the given values in the above formula, we get:

$4.29\times 10^{-19}J=(6.626\times 10^{-34}Js)\times \frac{(3\times 10^{8}m/s)}{\lambda}$

$\lambda=4.63\times 10^{-7}m=4.63\times 10^{-7}\times 10^9nm=4.63\times 10^{2}nm$

Conversion used : $1nm=10^{-9}m$

Therefore, the wavelength of photon is, $4.63\times 10^{2}nm$

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3 years ago

What are two ways thermal energy can be increased in a system?

MaRussiya [10]

Adding thermal energy
Performing work on the system

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3 years ago

Which of the following best describes the function of a resistor in an electrical circuit?

KonstantinChe [14]

Answer:

It controls the amount of current.

Explanation:

A resistor helps control and maintain the circuit which is it's main function.

8 0

3 years ago

Question 8 what is the total resistance of a parallel circuit consisting of g1 = 0.004 s, g2 = 0.002 s, g3=0.001s, and g4 = 0.00

andreyandreev [35.5K]

Since the total conductance is 0.0075 s, the total resistance is 133-1/3 ohms.

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3 years ago